Patch #1495999: Part two of Windows CE changes.

- update header checks, using autoconf
- provide dummies for getenv, environ, and GetVersion
- adjust MSC_VER check in socketmodule.c

Python/pythonrun.c

@@ -17,7 +17,9 @@
 #include "eval.h"
 #include "marshal.h"
 
+#ifdef HAVE_SIGNAL_H
 #include <signal.h>
+#endif
 
 #ifdef HAVE_LANGINFO_H
 #include <locale.h>